#include<stdio.h>
#include<math.h>
int main(void)
{
	float i = 2.3;
	if(fabs(i - 2.3) < 0.000001)
	{
		printf("it is 2.3\n");
	}
	else
	{
		printf("it not is 2.3 \n");
	}
	return 0;
}